CN104052184A - Spindle motor - Google Patents

Spindle motor Download PDF

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Publication number
CN104052184A
CN104052184A CN201310380547.4A CN201310380547A CN104052184A CN 104052184 A CN104052184 A CN 104052184A CN 201310380547 A CN201310380547 A CN 201310380547A CN 104052184 A CN104052184 A CN 104052184A
Authority
CN
China
Prior art keywords
thrust
axle
thrust component
spindle motor
component
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201310380547.4A
Other languages
Chinese (zh)
Inventor
郑新永
韩勋熙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electro Mechanics Co Ltd
Original Assignee
Samsung Electro Mechanics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electro Mechanics Co Ltd filed Critical Samsung Electro Mechanics Co Ltd
Publication of CN104052184A publication Critical patent/CN104052184A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/086—Structural association with bearings radially supporting the rotor around a fixed spindle; radially supporting the rotor directly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/74—Sealings of sliding-contact bearings
    • F16C33/741—Sealings of sliding-contact bearings by means of a fluid
    • F16C33/743—Sealings of sliding-contact bearings by means of a fluid retained in the sealing gap
    • F16C33/745—Sealings of sliding-contact bearings by means of a fluid retained in the sealing gap by capillary action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
    • H02K5/1677—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings radially supporting the rotor around a fixed spindle; radially supporting the rotor directly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/46—Gap sizes or clearances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2370/00—Apparatus relating to physics, e.g. instruments
    • F16C2370/12—Hard disk drives or the like

Abstract

There is provided a spindle motor including: a rotating body including a sleeve part disposed between a thrust member and a flange part of a shaft, a connection part extended from the sleeve part, and a rotor hub part extended from the connection part, 0.5 mm<min{L1, L2}<{(H-0.3)-(h1+h2+h3)}/cos [theta] is satisfied.

Description

Spindle motor
The application requires to be submitted on March 13rd, 2013 priority of the 10-2013-0026635 korean patent application of Korea S Department of Intellectual Property, and the open of this application is contained in this by reference.
Technical field
The present invention relates to a kind of spindle motor.
Background technology
Information recording and transcriber (such as hard disk drive etc.) comprise the spindle motor being installed on wherein, so that disc spins.In addition, in hard disk drive, can use fixed axis type spindle motor, wherein, the axle with strong resistance to impact is fixed to the housing of hard disk drive.
That is, spindle motor can be provided with fixed axis, to prevent that the not readable or information of the information on hard disk of being stored in causing because of external impact from can not write hard disk.
Meanwhile, in the structure of being installed regularly at axle, sleeve is as the rotating member pivoting, and rotor hub is attached to sleeve, to construct rotating main body.
In addition, rotor hub can with sleeve interference fit in be mounted, thereby rotor hub can be rotated together with sleeve.That is, sleeve and rotor hub can be attached to each other with the scheme of interference fit.
Yet in the situation that sleeve and rotor hub are attached to each other with the scheme of interference fit, sleeve can be out of shape because being press-fitted with joint efforts.In order to prevent this problem, developed the structure that sleeve and rotor hub are out of shape each other integratedly.
Yet according to the thickness of the spindle motor trend of attenuation gradually, the connecting portion branch between sleeve and rotor hub is due to external force or external impact and permanent deformation.
In addition, in the situation that axle is installed as fixed component regularly, the contact area between axle and the mating surface of axle institute combination may not provide fully, thereby the adhesion between axle and fixed component can be low.
That is,, while externally impacting, axle can be easily separated each other with fixed component.
The special permission of [patent document 1] 2010-0064349 Korean Patent is announced
Summary of the invention
The application's one side provides a kind of can reduce the spindle motor that dish tilts when clamping disk.
The application's one side also provide a kind of can reduce the axle that causes because of external impact and divided stator from the spindle motor of phenomenon.
According to an aspect of the present invention, provide a kind of spindle motor, described spindle motor comprises: base component, be provided with mounting portion, and stator core is fixedly mounted on mounting portion, axle, comprises and has the main part of cylinder form, the flange portion extending from the bottom of main part and the bound fraction that extends vertically and be attached to the interior perimeter surface of mounting portion from flange portion, thrust component, is fixedly mounted on the upper end of axle, rotating main body, comprise the sleeve part being arranged between thrust component and the flange portion of axle, the rotor hub part that extend the He Cong coupling part, coupling part of extending from sleeve part, wherein, beeline between thrust component and bound fraction is L1, beeline between thrust component and mounting portion is L2, the thickness of hard disk drive is H, surperficial vertical distance from the surface of the top of thrust component to the below of thrust component is h1, the thickness of flange portion is h2, vertical distance from the upper surface of flange portion to the top surface of bound fraction is h3, the line vertically extending from the outer surface of thrust component and there is L1 and L2 the connecting line of smaller value between angle while being θ, and when the thickness of coupling part is determined by the smaller value in L1 and L2, meet: 0.5mm<min{L1, L2}<{ (H-0.3)-(h1+h2+h3) }/cos θ.
Described spindle motor can also comprise the lid member being fixedly mounted on rotating main body or thrust component, to prevent the clearance leakage of lubricating fluid from forming by rotating main body and thrust component.
Axle can comprise that external diameter reduces part, and thrust component is attached to this external diameter and reduces part.
Axle can be larger in the roughness of other parts than axle in the roughness of the part of thrust component institute combination.
Thrust component can comprise the insertion jut being inserted in the insertion groove being formed in sleeve part.
The outer surface of thrust component can be provided with inclined surface, be set to form the interface between lubricating fluid and air together with the opposed face of the rotating main body of the outer surface of thrust component.
The bottom of the outer surface of sleeve part can be provided with sloping portion, together with the interior perimeter surface with bound fraction, forms the interface between lubricating fluid and air.
Sleeve part can be provided with the circulation port in axial direction forming.
Upper radial dynamic pressure groove and lower radial dynamic pressure groove can be formed at least one in the outer surface of the interior perimeter surface of sleeve part and the main part of axle.
Upper thrust dynamic pressure grooves can be formed at least one in the lower surface of thrust component and the upper surface of sleeve part.
Lower thrust dynamic pressure grooves can be formed at least one in the upper surface of flange portion and the lower surface of sleeve part.
Rotor hub part can be provided with the magnet being set in the face of the leading edge of stator core, and magnet magnetic center in the axial direction can be arranged on the high position, position than stator core magnetic center in the axial direction.
Sleeve part, coupling part and rotor hub part can form each other.
According to a further aspect in the invention, provide a kind of spindle motor, described spindle motor comprises: base component, be provided with mounting portion, and stator core is fixedly mounted on mounting portion, lower thrust component, is inserted in mounting portion, descends thus thrust component to be fixedly mounted in mounting portion, and lower thrust component comprises the disc portion of the shape with dish and the bound fraction extending from the edge of disc portion, axle, the bottom of axle is fixedly mounted on lower thrust component, and the upper end of axle is provided with thrust sector, rotating main body, comprise the sleeve part being arranged between thrust sector and lower thrust component, the rotor hub part that extend the He Cong coupling part, coupling part of extending from sleeve part, wherein, beeline between upper thrust sector and bound fraction is L1, beeline between upper thrust sector and mounting portion is L2, the thickness of hard disk drive is H, surperficial vertical distance from the surface of the top of upper thrust sector to the below of upper thrust sector is h1, the thickness of disc portion is h2, vertical distance from the upper surface of disc portion to the top surface of bound fraction is h3, the line vertically extending from the outer surface of upper thrust sector and there is L1 and L2 in the connecting line of smaller value between angle while being θ, and when the thickness of coupling part is determined by the smaller value in L1 and L2, meet: 0.5mm<min{L1, L2}<{ (H-0.3)-(h1+h2+h3) }/cos θ.
Described spindle motor can also comprise the lid member being fixedly mounted on rotating main body or upper thrust sector, to prevent the clearance leakage of lubricating fluid from forming by rotating main body and thrust sector.
Axle can be larger in the roughness of other parts than axle in the roughness of the part of lower thrust component institute combination.
Axle can comprise that the external diameter of the bottom that is arranged on axle reduces part, and lower thrust component is attached to external diameter and reduces part.
Upper thrust sector can comprise radially the projection claw that the flange that extends from the upper end of axle and the edge along downward axial direction from flange extend.
Projection claw can be inserted in the insertion groove being formed in sleeve part.
Upper thrust dynamic pressure grooves can be formed at least one in the lower surface of flange and the upper surface of sleeve part.
Sleeve part can be provided with the circulation port in axial direction forming.
Sleeve part, coupling part and rotor hub part can form each other.
Accompanying drawing explanation
By the detailed description of carrying out below in conjunction with accompanying drawing, above and other of the present invention aspect, feature and other advantages will be expressly understood more, in the accompanying drawings:
Fig. 1 is the schematic cross sectional views illustrating according to the spindle motor of the embodiment of the present invention;
Fig. 2 is the zoomed-in view of the A part in Fig. 1;
Fig. 3 is for describing according to the curve chart of the effect of the spindle motor of the embodiment of the present invention;
Fig. 4 illustrates the schematic cross sectional views of spindle motor according to another embodiment of the present invention;
Fig. 5 is the zoomed-in view that the B part in Fig. 4 is shown;
Fig. 6 illustrates the schematic cross sectional views of spindle motor according to another embodiment of the present invention;
Fig. 7 illustrates the schematic cross sectional views of spindle motor according to another embodiment of the present invention.
Embodiment
Now with reference to accompanying drawing, describe embodiments of the invention in detail.Embodiments of the invention can be revised in many different forms, and scope of the present invention should not be limited to embodiment set forth herein.Say definitely, providing these embodiment to make the disclosure will be thorough and complete, and design of the present invention fully will be conveyed to those skilled in the art.In accompanying drawing of the present invention, for clarity, may exaggerate the shape and size of element.
Fig. 1 is the schematic cross sectional views illustrating according to the spindle motor of the embodiment of the present invention; Fig. 2 is the zoomed-in view of the A part in Fig. 1; Fig. 3 is for describing according to the curve chart of the effect of the spindle motor of the embodiment of the present invention.
Referring to figs. 1 through Fig. 3, for example, according to the spindle motor 100 of the embodiment of the present invention, can comprise base component 110, axle 120, thrust component 130, rotating main body 140 and lid member 180.
Meanwhile, according to the spindle motor 100 of the embodiment of the present invention, can be such as the motor for information recording and transcriber (such as hard disk drive etc.).
Here, by the term first limiting about direction.As shown in Figure 1, axially refer to vertical direction,, from the bottom of axle 120 towards the direction of the upper end of axle 120 or from the upper end of axle 120 towards the direction of the bottom of axle 120, radial direction refers to horizontal direction, that is, the direction of the outer surface from axle 120 towards rotating main body 140 or the direction from the outer surface of rotating main body 140 towards axle 120.
In addition, circumferentially refer to along the direction of rotation of the outer surface of axle 120 or rotating main body 140.
Base component 110 can be provided with mounting portion 112, and stator core 102 is arranged on mounting portion 112.Mounting portion 112 can form installing hole 112a, and what above-mentioned axle 120 was inserted in installing hole 112a and axle 120 edges make progress axially extends from installing hole 112a.
Meanwhile, mounting portion 112 can comprise the stayed surface 112b on the outer surface that is formed on mounting portion 112, wherein, and stayed surface 112b support stator core 102.As example, the state that stator core 102 can be placed on the stayed surface 112b of mounting portion 112 with stator core 102 is fixedly mounted on mounting portion 112.
Although the inner-diameter portion whose of having described stator core 102 in the mode of example is in the present embodiment placed in the situation on the mounting portion 112 of base component 110, the invention is not restricted to this.That is, stator core 102 can also be arranged on independent installation component or axle (its alteration of form is in order to install stator core 102).In this case, base component 110 can not arrange mounting portion 112.
Axle 120 can comprise having the main part 122 of cylinder form, the flange portion 124 extending from the bottom of main part 122 and the bound fraction 126 that extends vertically and be attached to the interior perimeter surface of mounting portion 112 from flange portion 124.
In other words, axle 120 can be fixedly mounted on the mounting portion 112 of base component 110.
In addition, flange portion 124 can have the shape of dish, and bound fraction 126 can have the columnar shape of extending from the edge of flange portion 124.By main part 122, flange portion 124 and bound fraction 126, can form top is unlimited inner space.
In addition, axle 120 can comprise that the external diameter that is arranged on upper end reduces part 122a, and wherein, thrust component 130 is attached to external diameter and reduces part 122a.That is, the upper end of main part 122 can be provided with thrust component 130 external diameter combined thereon and reduces part 122a.
In addition, the roughness of the part of the combined propulsive force member 130 of axle 120 can be larger than the roughness of the other parts of axle 120.In other words, external diameter reduce the surface of part 122a can be more coarse than the other parts of main part 122.
Therefore, when installed thrust member 130, the adhesion between thrust component 130 and axle 120 can increase.
Meanwhile, axle 120 can have surperficial from it recessed screw hole 122b, and axle 120 can form the upper shell (not shown) that is incorporated into hard disk drive.
In addition, external diameter reduces part 122a can have the adhesive groove 122c that is formed on its bottom, and wherein, adhesive groove 122c fills promising axle 120 and thrust component 130 are bonded to each other and the adhesive that applies.In addition, adhesive groove 122c can filling adhesive, to increase the adhesion between axle 120 and thrust component 130.
Meanwhile, the top edge of main part 122 can be circular, thereby thrust component 130 can easily be attached to main part 122.Or the top edge of main part 122 can be provided with chamfering (chamfer).
Thrust component 130 can be fixedly mounted in the upper end of axle 120.For this reason, thrust component 130 can have the through hole 132 being formed on wherein, and the bottom of the interior perimeter surface of thrust component 130 can be provided with chamfering, or can be rounded, thereby thrust component 130 easily is attached to axle 120.
Meanwhile, thrust component 130 can comprise the insertion jut 134 in the insertion groove 152 being inserted in the sleeve part 150 that is formed on rotating main body 140.As implied above, owing to inserting jut 134, be formed on thrust component 130, the amount of the lubricating fluid of therefore filling can increase.
In addition, the outer surface of thrust component 130 can be provided with inclined surface 136, with be set to form the interface (that is, liquid-gas interface) between lubricating fluid and air together with the opposed face 142 of the rotating main body 140 of the outer surface of thrust component 130.More particularly, the upper end of the outer surface of thrust component 130 can be provided with inclined surface 136, thereby the external diameter of thrust component 130 reduces, liquid-gas interface can be formed in the gap that the opposed face 142 by inclined surface 136 and rotating main body 140 forms by capillarity.
In addition, thrust component 130 has the step part 138 being formed in its upper surface.
Rotating main body 140 can comprise the sleeve part 150 being arranged between thrust component 130 and the flange portion 124 of axle 120, the rotor hub part 170 that extend the 150 160He Cong coupling parts, coupling part of extending 160 from sleeve part.
Meanwhile, sleeve part 150, coupling part 160 and rotor hub part 170 can form each other.
Sleeve part 150 can form with axle 120 bearing clearance that lubricating fluid is wherein set together with thrust component 130.In addition, sleeve part 150 can be provided with the axis hole 151 that the main part 122 of axle 120 runs through.
Meanwhile, the bottom of the outer surface of sleeve part 150 can be provided with sloping portion 153, together with the interior perimeter surface with bound fraction 126, forms the interface between lubricating fluid and air.
In addition, according to the spindle motor 100 of the embodiment of the present invention, two liquid-gas interfaces can be set, and there is lubricating fluid and be arranged on the full interstitital texture in all bearing clearancees.
In addition, sleeve part 150 can be provided with the circulation port 154 in axial direction forming.One end of circulation port 154 can be opened wide towards above-mentioned insertion groove 152, the other end of circulation port 154 can be towards sleeve part 150 lower surface open wide.
Meanwhile, sleeve part 150 can comprise upper radial dynamic pressure groove 155 and the lower radial dynamic pressure groove 156 forming along perimeter surface in it, and wherein, upper radial dynamic pressure groove 155 and lower radial dynamic pressure groove 156 are set to separated from one another.When rotating main body 140 rotation, by upper radial dynamic pressure groove 155 and lower radial dynamic pressure groove 156, produce hydrodynamic, thereby rotating main body 140 can more stably rotate.
Yet, although described in the present embodiment by way of example the situation in the interior perimeter surface that upper radial dynamic pressure groove 155 and lower radial dynamic pressure groove 156 be formed on sleeve part 150, the invention is not restricted to this.That is, upper radial dynamic pressure groove 155 and lower radial dynamic pressure groove 156 can also be formed in the outer surface of main part 122 of axle 120.Or upper radial dynamic pressure groove 155 and lower radial dynamic pressure groove 156 can be formed in the interior perimeter surface of sleeve part 150 and the outer surface of main part 122.
In addition, upper radial dynamic pressure groove 155 and lower radial dynamic pressure groove 156 can have herringbone pattern or spiral pattern.
In addition, sleeve part 150 can have the upper thrust dynamic pressure grooves 157 being formed in its upper surface.Upper thrust dynamic pressure grooves 157 can radially inwardly arrange from inserting groove 152.
Meanwhile, although described in the present embodiment by way of example the situation in the upper surface that upper thrust dynamic pressure grooves 157 is formed on sleeve part 150, the invention is not restricted to this.That is, upper thrust dynamic pressure grooves 157 can also be formed in the lower surface of thrust component 130.Or upper thrust dynamic pressure grooves 157 can be formed in the lower surface of thrust component 130 and the upper surface of sleeve part 150.
In addition, sleeve part 150 can have the lower thrust dynamic pressure grooves 158 being formed in its lower surface.In addition, lower thrust dynamic pressure grooves 158 can be arranged in the region that forms circulation port 154 formation, not disturb circulation port 154.
Meanwhile, although described in the present embodiment by way of example the situation in the lower surface that time thrust dynamic pressure grooves 158 is formed on sleeve part 150, the invention is not restricted to this.That is, lower thrust dynamic pressure grooves 158 can also be formed in the upper surface of flange portion 124.Or lower thrust dynamic pressure grooves 158 can be formed in the upper surface of flange portion 124 and the lower surface of sleeve part 150.
Can be from sleeve part 150 extend and can be for sleeve part 150 and rotor hub part 170 are connected to each other coupling part 160.Meanwhile, coupling part 160 can have predetermined thickness, and this will be described in detail below.
Rotor hub part 170 can 160 extensions from coupling part.Meanwhile, rotor hub part 170 can comprise that the main body 172, the edge along downward axial direction from main body 172 of the shape with dish are extended and cylindrical wall main body 174 of magnet 174a is installed for it and the dish that radially extends from the terminal part of cylindrical wall main body 174 supports claw (jaw) 176.
Meanwhile, the inner surface of magnet 174a can be set to the leading edge in the face of stator core 102.
Meanwhile, magnet 174a produces the permanent magnet of the magnetic force with predetermined strength by circumferential its N utmost point of alternating magnetization in edge and the S utmost point.
Here, will the rotary actuation scheme of rotating main body 140 schematically be described.When electricity being fed to the coil 101 being wound around around stator core 102, by being wound with stator core 102 and the electromagnetic interaction between magnet 174a of coil 101 around, can produce the actuating force that can make rotating main body 140 rotate.
That is, magnet 174a and being set in the face of magnet 174a and the stator core 102 that is wound with coil 101 around electromagnetic interaction each other, so that rotating main body 140 rotations.
Meanwhile, magnet 174a magnetic center in the axial direction can be arranged on the high position, position than stator core 102 magnetic center in the axial direction.Therefore, can in rotating main body 140, produce by the interaction between magnet 174a and stator core 102 power of pointing to downward axial direction.
Next, by the more detailed description providing below the thickness of coupling part 160.
First, beeline between thrust component 130 and bound fraction 126 is restricted to L1, beeline between thrust component 130 and mounting portion 112 is restricted to L2, the thickness of hard disk drive is restricted to H, surperficial vertical distance from the surface of the top of thrust component 130 to the below of thrust component 130 is restricted to h1, the thickness of flange portion 124 is restricted to h2, vertical distance from the upper surface of flange portion 124 to the top surface of bound fraction 126 is restricted to h3, the line vertically extending from the outer surface of thrust component 130 and there is L1 and L2 the connecting line of smaller value between angle be restricted to θ.
Meanwhile, the thickness of coupling part 160 can be determined by the smaller value in L1 and L2.
In addition, the smaller value in L1 and L2 can meet 0.5mm<min{L1, L2}<{ (H-0.3)-(h1+h2+h3) }/cos θ.
That is,, when the thickness of coupling part 160 has the value equating with smaller value in L1 and L2, coupling part 160 one-tenth-value thickness 1/10s can be greater than 0.5mm and be less than the value of { (H-0.3)-(h1+h2+h3) }/cos θ.
In addition, be understandable that, in curve chart, in the situation that the Thickness Ratio 0.5mm of coupling part 160 is little, the displacement that the dish of rotor hub part 170 support claw 176 is in axial direction gone up increases fast as shown in Figure 3.
Therefore, the thickness of coupling part 160 need to be larger than 0.5mm.
In addition, the thickness of coupling part 160 need to have than the little value of value of { (H-0.3)-(h1+h2+h3) }/cos θ.
As mentioned above, because the thickness of coupling part 160 is in above-mentioned scope, therefore can reduce the inclination of the dish that causes due to externally applied forces when the sectional fixture.
That is, can reduce because externally applied forces when the sectional fixture causes the edge of rotor hub part 170 along the sagging phenomenon of downward axial direction.In other words, when clamping disk, the edge of rotor hub part 170 can be along downward axial direction sagging admissible deflection.
Lid member 180 can be fixedly mounted on rotating main body 140, to prevent the clearance leakage of lubricating fluid from being formed by rotating main body 140 and thrust component 130.
Meanwhile, lid member 180 can have and is attached to the sweep 182 of rotating main body 140 and the hermetic unit from sweep 182 towards internal diameter direction bending 184.The inner-diameter portion whose of hermetic unit 184 can be arranged on the step part 138 of above-mentioned thrust component 130.
Therefore, can prevent that lubricating fluid is distributed to outside phenomenon from the liquid-gas interface being arranged between the outer surface of thrust component 130 and the opposed face 142 of rotating main body 140.
As mentioned above, because the one-tenth-value thickness 1/10 of coupling part 160 is greater than 0.5mm and is less than the value of { (H-0.3)-(h1+h2+h3) }/cos θ, therefore can reduce to cause due to externally applied forces when the sectional fixture inclination of dish.
That is, can reduce because externally applied forces when the sectional fixture causes the edge of rotor hub part 170 along the sagging phenomenon of downward axial direction.In other words, when clamping disk, the edge of rotor hub part 170 can be on downward axial direction sagging admissible deflection.
Axle 120 comprises flange portion 124 and bound fraction 126, thereby can reduce the separation of the axle 120 that causes because of external impact.
In addition, the surface roughness of the upper end of the axle 120 that thrust component 130 is bonded thereto changes, thereby can reduce the axle 120 that causes because of external impact and the separation between thrust component 130.
Hereinafter, spindle motor is according to another embodiment of the present invention described with reference to the accompanying drawings.
Fig. 4 illustrates the schematic cross sectional views of spindle motor according to another embodiment of the present invention; Fig. 5 is the zoomed-in view that the B part in Fig. 4 is shown.
With reference to Fig. 4 and Fig. 5, in the mode of example, spindle motor 200 can comprise base component 210, lower thrust component 220, axle 230, rotating main body 240 and lid member 280 according to another embodiment of the present invention.
Base component 210 can comprise mounting portion 212, and stator core 202 is arranged on mounting portion 212.Mounting portion 212 can form installing hole 212a and mounting portion 212 along extending axially of making progress, and above-mentioned axle 230 is inserted in installing hole 212a.
Meanwhile, mounting portion 212 can comprise the stayed surface 212b on the outer surface that is formed on mounting portion 212, wherein, and stayed surface 212b support stator core 202.As example, the state that stator core 202 can be placed on the stayed surface 212b of mounting portion 212 with stator core 202 is fixedly mounted on mounting portion 212.
Lower thrust component 220 can be inserted in mounting portion 212, descends thus thrust component 220 to be fixedly mounted in mounting portion 212.Meanwhile, lower thrust component 220 can comprise the disc portion 222 of the shape with dish and the bound fraction 224 extending from the edge of disc portion 222.
In addition, disc portion 222 can have the formation installing hole 222a of part in the central, and wherein, axle 230 is inserted in installing hole 222a.In addition, bound fraction 224 can be attached to the mounting portion 212 of above-mentioned base component 210 with at least one in bonding scheme, press-fit arrangement and welding scheme.
The bottom of axle 230 can be fixedly mounted on lower thrust component 220.Meanwhile, the upper end of axle 230 can be provided with thrust sector 232.
In addition, upper thrust sector 232 can comprise radially the projection claw 232b that the flange 232a that extends from the upper end of axle 230 and the edge along downward axial direction from flange 232a extend.
The insertion groove 252(that projection claw 232b can be inserted into sleeve part 250 will be described below) in.As mentioned above, because projection claw 232b has the axial length in the insertion groove 252 that is enough inserted into sleeve part 250, therefore can increase the amount of the lubricating fluid of setting.
Simultaneously, the outer surface of upper thrust sector 232 can be provided with inclined surface 232c, with with rotating main body 240 be set to together with the opposed face 242 of the outer surface of upper thrust sector 232, form the interface (that is, liquid-gas interface) between lubricating fluid and air.
More particularly, the upper end of the outer surface of upper thrust sector 232 can be provided with inclined surface 232c, thereby the external diameter of upper thrust sector 232 reduces, liquid-gas interface can be formed in the gap that the opposed face 242 by inclined surface 232c and rotating main body 240 forms by capillarity.
In addition, in the upper surface of upper thrust sector 232, can be formed with step part 232d.
Meanwhile, axle 230 can be larger than the roughness of other parts in the roughness of the part of lower thrust component 220 combinations.In other words, the bottom of axle 230 can have the surface more coarse than other parts.
Therefore, the adhesion between lower thrust component 220 and axle 230 can increase.
Yet, although described in the present embodiment by way of example the situation that axle 230 and lower thrust component 220 are bonded to each other by adhesive, the invention is not restricted to this.That is, axle 230 and lower thrust component 220 can also be bonded to each other by welding.
In addition, axle 230 can have surperficial from it recessed screw hole 236, and axle 230 can form the upper shell (not shown) that is incorporated into hard disk drive.
Meanwhile, the bottom of the inner surface of the edge of the upper end of axle 230 and/or lower thrust component 220 can be provided with rounded portion and chamfering, so that axle 230 is attached to lower thrust component 220.
Rotating main body 240 can comprise the sleeve part 250 being arranged between thrust sector 232 and lower thrust component 220, the rotor hub part 270 that extend the 250 260He Cong coupling parts, coupling part of extending 260 from sleeve part.
Meanwhile, sleeve part 250, coupling part 260 and rotor hub part 270 can form each other.
Sleeve part 250 can form with lower thrust component 230 bearing clearance that lubricating fluid is set together with axle 230.In addition, sleeve part 250 can be provided with the axis hole 251 that axle 230 runs through.
Meanwhile, the bottom of the outer surface of sleeve part 250 can be provided with sloping portion 253, together with the interior perimeter surface of the bound fraction 224 with lower thrust component 220, forms the interface between lubricating fluid and air.
In addition, spindle motor 200 can arrange two liquid-gas interfaces according to another embodiment of the present invention, and has lubricating fluid and be arranged on the full interstitital texture in all bearing clearancees.
In addition, sleeve part 250 can be provided with the circulation port 254 in axial direction forming.One end of circulation port 254 can be opened wide towards above-mentioned insertion groove 252, the other end of circulation port 254 can be towards sleeve part 250 lower surface open wide.
Meanwhile, sleeve part 250 can comprise upper radial dynamic pressure groove 255 and the lower radial dynamic pressure groove 256 forming along perimeter surface in it, and wherein, upper radial dynamic pressure groove 255 and lower radial dynamic pressure groove 256 are set to separated from one another.When rotating main body 240 rotation, by upper radial dynamic pressure groove 255 and lower radial dynamic pressure groove 256, produce hydrodynamic, thereby rotating main body 240 can more stably rotate.
Yet, although described in the present embodiment by way of example the situation in the interior perimeter surface that upper radial dynamic pressure groove 255 and lower radial dynamic pressure groove 256 be formed on sleeve part 250, the invention is not restricted to this.That is, upper radial dynamic pressure groove 255 and lower radial dynamic pressure groove 256 can also be formed in the outer surface of axle 230.
In addition, upper radial dynamic pressure groove 255 and lower radial dynamic pressure groove 256 can have herringbone pattern or spiral pattern.
In addition, sleeve part 250 can have the upper thrust dynamic pressure grooves 257 being formed in its upper surface.Upper thrust dynamic pressure grooves 257 can radially be arranged on to be inserted in groove 252.
Meanwhile, although described in the present embodiment by way of example the situation in the upper surface that upper thrust dynamic pressure grooves 257 is formed on sleeve part 250, the invention is not restricted to this.That is, upper thrust dynamic pressure grooves 257 can also be formed in the lower surface of upper thrust sector 232 of axle 230.Or upper thrust dynamic pressure grooves 257 can be formed in the lower surface of flange 232a and the upper surface of sleeve part 250.
In addition, sleeve part 250 can have the lower thrust dynamic pressure grooves 258 being formed in its lower surface.In addition, lower thrust dynamic pressure grooves 258 can be arranged in the region that forms circulation port 254, not disturb circulation port 254.
Meanwhile, although described in the present embodiment by way of example the situation in the lower surface that time thrust dynamic pressure grooves 258 is formed on sleeve part 250, the invention is not restricted to this.That is, lower thrust dynamic pressure grooves 258 can also be formed in the upper surface of disc portion 222 of lower thrust component 220.
Can be from sleeve part 250 extend and can be for sleeve part 250 and rotor hub part 270 are connected to each other coupling part 260.Meanwhile, coupling part 260 can have predetermined thickness, and this will be described in detail below.
Rotor hub part 270 can 260 extensions from coupling part.Meanwhile, rotor hub part 270 can comprise that the main body 272, the edge along downward axial direction from main body 272 of the shape with dish are extended and cylindrical wall main body 274 of magnet 274a is installed for it and the dish that radially extends from the terminal part of cylindrical wall main body 274 supports claw 276.
Meanwhile, the inner surface of magnet 274a can be set to the leading edge in the face of stator core 202.
In addition, magnet 274a magnetic center in the axial direction can be arranged on the high position, position than stator core 102 magnetic center in the axial direction.Therefore, can in rotating main body 240, produce by the interaction between magnet 274a and stator core 202 power of pointing to downward axial direction.
Next, by the more detailed description providing below the thickness of coupling part 260.
First, beeline between upper thrust sector 232 and bound fraction 224 is restricted to L1, beeline between upper thrust sector 232 and mounting portion 212 is restricted to L2, the thickness of hard disk drive is restricted to H, surperficial vertical distance from the surface of the top of upper thrust sector 232 to the below of upper thrust sector 232 is restricted to h1, the thickness of disc portion 222 is restricted to h2, vertical distance from the upper surface of disc portion 222 to the top surface of bound fraction 224 is restricted to h3, the line vertically extending from the outer surface of upper thrust sector 232 and there is L1 and L2 in the connecting line of smaller value between angle be restricted to θ.
Meanwhile, the thickness of coupling part 260 can have the value identical with smaller value in L1 and L2.
In addition, the smaller value in L1 and L2 can meet 0.5mm<min{L1, L2}<{ (H-0.3)-(h1+h2+h3) }/cos θ.
That is,, when the thickness of coupling part 260 has the value equating with smaller value in L1 and L2, coupling part 260 one-tenth-value thickness 1/10s can be greater than 0.5mm and be less than the value of { (H-0.3)-(h1+h2+h3) }/cos θ.
As mentioned above, because the thickness of coupling part 260 is in above-mentioned scope, therefore can reduce the inclination of the dish that causes due to externally applied forces when the sectional fixture.
That is, can reduce because externally applied forces when the sectional fixture causes the edge of rotor hub part 270 along the sagging phenomenon of downward axial direction.In other words, when clamping disk, the edge of rotor hub part 270 can be along downward axial direction sagging admissible deflection.
Lid member 280 can be fixedly mounted on rotating main body 240, to prevent the clearance leakage of lubricating fluid from being formed by rotating main body 240 and thrust sector 232.
Meanwhile, lid member 280 can have sweep 282 and the hermetic unit 284 along internal diameter direction from sweep 282 bendings that is attached to rotating main body 240.The inner-diameter portion whose of hermetic unit 284 can be arranged on the step part 232d of above-mentioned upper thrust sector 232.
Therefore, can prevent that the liquid-gas interface between the outer surface of lubricating fluid thrust sector 232 from being arranged on and the opposed face 242 of rotating main body 240 is distributed to outside phenomenon.
Hereinafter, spindle motor is according to another embodiment of the present invention described with reference to the accompanying drawings.Yet, by identical label, indicate the assembly identical with the assembly of above-mentioned spindle motor according to another embodiment of the present invention, and will omit its detailed description.
Fig. 6 illustrates the schematic cross sectional views of spindle motor according to another embodiment of the present invention.
With reference to Fig. 6, by way of example, spindle motor 300 can comprise base component 210, lower thrust component 220, axle 230, rotating main body 240 and lid member 280 according to another embodiment of the present invention.
Due to except the external diameter of the axle being described below 230 is reduced part 334, the base component 210, lower thrust component 220, axle 230, rotating main body 240 and the lid member 280 that are included in spindle motor 300 are according to another embodiment of the present invention identical with lid member 280 with base component 210, lower thrust component 220, axle 230, rotating main body 240 in the spindle motor 200 being included according to another embodiment of the present invention, therefore by its detailed description of omission and by description above, replace.
Axle 230 can comprise that the external diameter that is arranged on its bottom reduces part 334, and wherein, lower thrust component 220 is attached to external diameter and reduces part 334.In addition, external diameter reduces part 334 and can have the roughness larger than other parts.
Meanwhile, external diameter reduces part 334 can have the adhesive groove 334a that is formed on its upper end, and wherein, adhesive groove 334a is filled with the adhesive for axle 230 and lower thrust component 220 being bonded to each other and applying.In addition, adhesive groove 334a can filling adhesive, to increase the adhesion between axle 230 and lower thrust component 220.
Meanwhile, the bottom that external diameter reduces the edge of part 334 or the inner surface of lower thrust component 220 can be provided with rounded portion or chamfering, so that axle 230 is attached to lower thrust component 220.
Hereinafter, spindle motor is according to another embodiment of the present invention described with reference to the accompanying drawings.
Fig. 7 illustrates the schematic cross sectional views of spindle motor according to another embodiment of the present invention.
With reference to Fig. 7, by way of example, spindle motor 400 can comprise base component 210, lower thrust component 220, axle 430, rotating main body 240 and lid member 280 according to another embodiment of the present invention.
Simultaneously, owing to being included in, spindle motor 400 comprises according to another embodiment of the present invention base component 210, lower thrust component 220, rotating main body 240 and lid member 280 are identical with lid member 280 with base component 210, lower thrust component 220, rotating main body 240 in the spindle motor 200 being included according to another embodiment of the present invention, therefore will omit its detailed description.
The bottom of axle 430 can be fixedly mounted on lower thrust component 220.Meanwhile, the upper end of axle 430 is provided with thrust sector 432.
Be different from the upper thrust sector 232 being included in above-mentioned spindle motor according to another embodiment of the present invention 200, upper thrust sector 432 can have the shape of dish and not comprise projection claw 232b.
Therefore, inserting groove 252 is not formed in the sleeve part 250 in rotating main body 240.
Simultaneously, the outer surface of upper thrust sector 432 can be provided with inclined surface 432c, with with rotating main body 240 be set to together with the opposed face 242 of the outer surface of upper thrust sector 432, form the interface (that is, liquid-gas interface) between lubricating fluid and air.
More particularly, the upper end of the outer surface of upper thrust sector 432 can be provided with inclined surface 432c, thereby the external diameter of upper thrust sector 432 reduces, liquid-gas interface can be formed in the gap that the opposed face 242 by inclined surface 432c and rotating main body 240 forms by capillarity.
In addition, upper thrust component 432 can have the step part 432d being formed in its upper surface.
Meanwhile, axle 430 can be larger than the roughness of other parts in the roughness of the part of lower thrust component 220 combinations.In other words, the bottom of axle 230 can have the surface more coarse than other parts.
Therefore, the adhesion between lower thrust component 220 and axle 430 can increase.
As mentioned above, according to embodiments of the invention, because the minimum thickness of the coupling part of rotating main body has the smaller value in L1 and L2 and meets 0.5mm<min{L1, L2}<{ (H-0.3)-(h1+h2+h3) }/cos θ, therefore can reduce to cause due to externally applied forces when the sectional fixture inclination of dish.
That is, can reduce because externally applied forces when the sectional fixture causes the edge of rotor hub part along the sagging phenomenon of downward axial direction.
In addition, axle comprises flange portion and bound fraction, thereby can reduce the separation of the axle that causes because of external impact.
And the surface roughness of the upper end of the axle that thrust component is bonded thereto changes, thereby can reduce the axle that causes because of external impact and the separation between thrust component.
Further, the surface roughness of the bottom of the axle that thrust component is bonded thereto changes, thereby can reduce the axle that causes because of external impact and the separation between lower thrust component.
Although illustrated and described the present invention in conjunction with the embodiments, those skilled in the art will be clear that, in the situation that do not depart from the spirit and scope of the present invention that are defined by the claims, can modify and modification.

Claims (22)

1. a spindle motor, comprising:
Base component, is provided with mounting portion, and stator core is fixedly mounted on mounting portion;
Axle, comprises and has the main part of cylinder form, the flange portion extending from the bottom of main part and the bound fraction that extends vertically and be attached to the interior perimeter surface of mounting portion from flange portion;
Thrust component, is fixedly mounted on the upper end of axle;
Rotating main body, comprises the rotor hub part that extend the sleeve part being arranged between thrust component and the flange portion of axle, the He Cong coupling part, coupling part of extending from sleeve part,
Wherein, beeline between thrust component and bound fraction is L1, beeline between thrust component and mounting portion is L2, the thickness of hard disk drive is H, surperficial vertical distance from the surface of the top of thrust component to the below of thrust component is h1, the thickness of flange portion is h2, vertical distance from the upper surface of flange portion to the top surface of bound fraction is h3, the line vertically extending from the outer surface of thrust component and there is L1 and L2 the connecting line of smaller value between angle while being θ, and when the thickness of coupling part is determined by the smaller value in L1 and L2, meet: 0.5mm<min{L1, L2}<{ (H-0.3)-(h1+h2+h3) }/cos θ.
2. spindle motor as claimed in claim 1, described spindle motor also comprises the lid member being fixedly mounted on rotating main body or thrust component, to prevent the clearance leakage of lubricating fluid from forming by rotating main body and thrust component.
3. spindle motor as claimed in claim 1, wherein, axle comprises that external diameter reduces part, thrust component is attached to external diameter and reduces part.
4. spindle motor as claimed in claim 1, wherein, axle is large in the roughness of other parts at the roughness ratio axle of the part of thrust component institute combination.
5. spindle motor as claimed in claim 1, wherein, thrust component comprises the insertion jut being inserted in the insertion groove being formed in sleeve part.
6. spindle motor as claimed in claim 1, wherein, the outer surface of thrust component is provided with inclined surface, be set to form the interface between lubricating fluid and air together with the opposed face of the rotating main body of the outer surface of thrust component.
7. spindle motor as claimed in claim 1, wherein, the bottom of the outer surface of sleeve part is provided with sloping portion, together with the interior perimeter surface with bound fraction, forms the interface between lubricating fluid and air.
8. spindle motor as claimed in claim 1, wherein, sleeve part is provided with the circulation port in axial direction forming.
9. spindle motor as claimed in claim 1, wherein, upper radial dynamic pressure groove and lower radial dynamic pressure groove are formed at least one in the outer surface of the interior perimeter surface of sleeve part and the main part of axle.
10. spindle motor as claimed in claim 1, wherein, upper thrust dynamic pressure grooves is formed at least one in the lower surface of thrust component and the upper surface of sleeve part.
11. spindle motors as claimed in claim 1, wherein, lower thrust dynamic pressure grooves is formed at least one in the upper surface of flange portion and the lower surface of sleeve part.
12. spindle motors as claimed in claim 1, wherein, rotor hub is partly provided with the magnet being set in the face of the leading edge of stator core,
Magnet magnetic center is in the axial direction arranged on the high position, position than stator core magnetic center in the axial direction.
13. spindle motors as claimed in claim 1, wherein, sleeve part, coupling part and rotor hub part form each other.
14. 1 kinds of spindle motors, comprising:
Base component, is provided with mounting portion, and stator core is fixedly mounted on mounting portion;
Lower thrust component, is inserted in mounting portion, descends thus thrust component to be fixedly mounted in mounting portion, and lower thrust component comprises the disc portion of the shape with dish and the bound fraction extending from the edge of disc portion;
Axle, the bottom of axle is fixedly mounted on lower thrust component, and the upper end of axle is provided with thrust sector;
Rotating main body, comprises the rotor hub part that extend the sleeve part being arranged between thrust sector and lower thrust component, the He Cong coupling part, coupling part of extending from sleeve part,
Wherein, beeline between upper thrust sector and bound fraction is L1, beeline between upper thrust sector and mounting portion is L2, the thickness of hard disk drive is H, surperficial vertical distance from the surface of the top of upper thrust sector to the below of upper thrust sector is h1, the thickness of disc portion is h2, vertical distance from the upper surface of disc portion to the top surface of bound fraction is h3, the line vertically extending from the outer surface of upper thrust sector and there is L1 and L2 in the connecting line of smaller value between angle while being θ, and when the thickness of coupling part is determined by the smaller value in L1 and L2, meet: 0.5mm<min{L1, L2}<{ (H-0.3)-(h1+h2+h3) }/cos θ.
15. spindle motors as claimed in claim 14, described spindle motor also comprises the lid member being fixedly mounted on rotating main body or upper thrust sector, to prevent the clearance leakage of lubricating fluid from forming by rotating main body and thrust sector.
16. spindle motors as claimed in claim 14, wherein, axle is large in the roughness of other parts at the roughness ratio axle of the part of lower thrust component institute combination.
17. spindle motors as claimed in claim 14, wherein, axle comprises that the external diameter of the bottom that is arranged on axle reduces part, lower thrust component is attached to external diameter and reduces part.
18. spindle motors as claimed in claim 14, wherein, upper thrust sector comprises radially the projection claw that the flange that extends from the upper end of axle and the edge along downward axial direction from flange extend.
19. spindle motors as claimed in claim 18, wherein, projection claw is inserted in the insertion groove being formed in sleeve part.
20. spindle motors as claimed in claim 18, wherein, upper thrust dynamic pressure grooves is formed at least one in the lower surface of flange and the upper surface of sleeve part.
21. spindle motors as claimed in claim 14, wherein, sleeve part is provided with the circulation port in axial direction forming.
22. spindle motors as claimed in claim 14, wherein, sleeve part, coupling part and rotor hub part form each other.
CN201310380547.4A 2013-03-13 2013-08-28 Spindle motor Pending CN104052184A (en)

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Application publication date: 20140917